When I take my German library ( not the WTS one) I can read that the witch was surprised by the approach of the elohim, the god she called up.
The book declares that it was gods will that an elohim came up and gives talk.
the witch was very confused as she had not awaited such effort.
That seems convincing for me. so the option is valid that the approaching elohim came in respect of god to tell Saul taht he is finished.
and when one son did not fell in the battle - who knows why or if he was really witnessed by Saul.
The Endor story is much convincing, that Saul got the answer he needed to get because of his bad heart